linux-kernel - Re: [PATCH -next V8 00/14] riscv: Add GENERIC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <875yep3tf9.fsf@all.your.base.are.belong.to.us>
Date:   Tue, 06 Dec 2022 08:03:38 +0100
From:   Björn Töpel <bjorn@...nel.org>
To:     Guo Ren <guoren@...nel.org>
Cc:     arnd@...db.de, palmer@...osinc.com, tglx@...utronix.de,
        peterz@...radead.org, luto@...nel.org, conor.dooley@...rochip.com,
        heiko@...ech.de, jszhang@...nel.org, lazyparser@...il.com,
        falcon@...ylab.org, chenhuacai@...nel.org, apatel@...tanamicro.com,
        atishp@...shpatra.org, palmer@...belt.com,
        paul.walmsley@...ive.com, mark.rutland@....com,
        zouyipeng@...wei.com, bigeasy@...utronix.de,
        David.Laight@...lab.com, chenzhongjin@...wei.com,
        greentime.hu@...ive.com, andy.chiu@...ive.com,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH -next V8 00/14] riscv: Add GENERIC_ENTRY support and
 related features

Guo Ren <guoren@...nel.org> writes:

> On Mon, Dec 5, 2022 at 5:46 PM Björn Töpel <bjorn@...nel.org> wrote:
>>
>> guoren@...nel.org writes:
>>
>> > From: Guo Ren <guoren@...ux.alibaba.com>
>> >
>> > The patches convert riscv to use the generic entry infrastructure from
>> > kernel/entry/*. Additionally, add independent irq stacks (IRQ_STACKS)
>> > for percpu to prevent kernel stack overflows. Add generic_entry based
>> > STACKLEAK support. Some optimization for entry.S with new .macro and
>> > merge ret_from_kernel_thread into ret_from_fork.
>> >
>> > We have tested it with rv64, rv32, rv64 + 32rootfs, all are passed.
>> >
>> > You can directly try it with:
>> > [1] https://github.com/guoren83/linux/tree/generic_entry_v8
>>
>> Guo, this is a really nice work, and I'm looking forward having generic
>> entry support for RV. However, there are many patches in this series
>> that really shouldn't be part of the series.
>>
>> Patch 2, 3, 4, and 10 should defintely be pulled out.
> Okay.
>
>>
>> I'm not sure 7, 8, and 9 belong to series, as it's really a separate
>> feature.
> The separate irq/softirq stack patches dpend on generic_entry tightly,
> so I recommand put them together.

I'd say *depends* on the series, not required for generic entry. Again,
keeping the series orthogonal and small is a good thing.

>> For GENERIC_ENTRY support only patch 1, 5, 6, 12, 13, and 14, really
>> required. The others are unrelated.
> Thx for the reminder; I will re-organize them.

This is a really nice clean up, and the reason I'm pushing for removing
unrelated patches in the series, is because I want to see it land in the
RV tree sooner, rather than later. Send these as follow-ups to generic
entry, once it lands in the tree.


Thank you for the hard work!
Björn